Qalculate Portable is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation). Features include a large library of customizable functions, unit calculations and conversion, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface (GTK+ and CLI).

## Features:

#### Math Library

• Calculation and parsing:
• Basic operations and operators: + – * / mod ^ E () && || ! < > >= <= != ~ & | << >> xor
• Fault-tolerant parsing of strings: log 5 / 2 .5 (3) + (2( 3 +5 = ln(5) / (2.5 * 3) + 2 * (3 + 5)
• Expressions may contain any combination of numbers, functions, units, variables, vectors and matrices, and dates
• Supports complex and infinite numbers
• Propagation of uncertainty
• Interval arithmetic
• Supports all common number bases, as well as negative and non-integer radices, sexagesimal numbers, time format, and roman numerals
• Ability to disable functions, variables, units or unknown variables for less confusion: e.g. when you do not want (a+b)^2 to mean (are+barn)^2 but (“a”+”b”)^2
• Customizable implicit multiplication
• Matrices and vectors, and related operations (determinants etc.)
• Verbose error messages
• Arbitrary precision
• RPN mode
• Result display:
• Supports all common number bases, as well as negative and non-integer radices, sexagesimal numbers, time format, and roman numerals
• Many customization options: precision, max/min decimals, complex form, multiplication sign, etc.
• Exact or approximate: sqrt(32) returns 4 * sqrt(2) or 5.66
• Simple and mixed fractions: 4 / 6 * 2 = 1.333… = 4/3 = 1 + 1/3
• Symbolic calculation:
• E.g. (x + y)^2 = x^2 + 2xy + y^2; 4 “apples” + 3 “oranges”
• Factorization and simplification
• Differentiation and integration
• Can solve most equations and inequalities
• Customizable assumptions give different results (e.g. ln(2x) = ln(2) + ln(x) if x is assumed positive)
• Functions:
• Hundreds of flexible functions: trigonometry, exponents and logarithms, combinatorics, geometry, calculus, statistics, finance, time and date, etc.
• Can easily be created, edit and saved to a standard XML file
• Units:
• Supports all SI units and prefixes (including binary), as well as imperial and other unit systems
• Automatic conversion: ft + yd + m = 2.2192 m
• Explicit conversion: 5 m/s to mi/h = 11.18 miles/hour
• Smart conversion: automatically converts 5 kg*m/s^2 to 5 N
• Currency conversion with retrieval of daily exchange rates
• Different name forms: abbreviation, singular, plural (m, meter, meters)
• Can easily be created, edited and saved to a standard XML file
• Variables and constants:
• Basic constants: pi, e, etc.
• Lots of physical constants (with or without units) and properties of chemical element
• CSV file import and export
• Can easily be created, edited and saved to a standard XML file
• Flexible – may contain simple numbers, units, or whole expressions
• Data sets with objects and associated properties in database-like structure
• Plotting:
• Uses Gnuplot
• Can plot functions or data (matrices and vectors)
• Ability to save plot to PNG image, postscript, etc.
• Several customization options
• and more… 